CN220627908U

CN220627908U - Battery module and battery pack

Info

Publication number: CN220627908U
Application number: CN202320519548.1U
Authority: CN
Inventors: 蹇兴文; 裴婷婷; 陈利权; 吴天宇; 杨刚; 李亚荣; 陈翔; 文曼; 王振园
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2024-03-19
Anticipated expiration: 2033-03-14

Abstract

The utility model relates to a battery module and a battery pack, wherein the battery module comprises: a battery assembly; a heat sink at least partially disposed within the battery assembly; and at least one fin which is positioned at one side of the battery component, is connected with the radiating fin and extends outwards, and a plurality of hollowed-out holes penetrating through the fin are formed in at least one fin. The heat dissipation fin is arranged in the battery assembly, and the at least one fin is arranged on one side of the battery assembly, so that the heat transfer in the battery assembly can be quickened by utilizing the heat dissipation fin, the risk of heat concentration in the battery assembly is reduced, the heat dissipation efficiency of the battery module is further improved, the internal temperature and the external temperature of the battery module are further balanced, the battery module is kept in a reasonable temperature range during operation, the influence of heat concentration on the performance of the battery module is reduced, and in addition, the structure of the heat dissipation fin and the fin is simple and convenient, and the maintenance difficulty of the battery module is reduced.

Description

Battery module and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery module and a battery pack.

Background

In recent years, the urgent demands for Electric Vehicles (EV) and battery energy storage stations (Battery Energy Storage System, BESS) are continuously increasing around the world. Among many energy storage technologies, lithium batteries are popular and dominant storage media with the advantages of high efficiency, low self-discharge rate, no memory effect, long cycle life and the like, and are widely applied to electric automobiles and battery energy storage stations.

The battery is limited in arrangement space due to the influence of the structures of the electric automobile and the battery energy storage station, so that the batteries are required to be closely arranged together, heat of the batteries is accumulated, the temperature of the batteries rises faster, and heat dissipation generated during the operation of the batteries is not facilitated. When the actual working temperature of the battery exceeds the normal range, the performance of the battery can be drastically reduced, and potential safety hazards such as ignition or explosion of the battery exist. In addition, the temperature of the batteries in the same module or battery pack can be different due to the fact that the positions of the single batteries are different, so that the inconsistency of the temperatures among the battery single batteries is increased, and the overall performance of the battery module or battery pack is reduced.

Therefore, effective heat management and control of the power battery system are necessary means for ensuring the thermal safety of the battery and improving the performance of the battery, especially, the heat dissipation structure of the battery heat management system (Battery Thermal Management System, BTMS) and the battery module is optimally designed, so that the battery is ensured to be at a proper working temperature and the temperature difference between the single batteries is within a reasonable range, and the heat dissipation structure is extremely important for the performance and safety of the electric automobile.

Disclosure of Invention

In view of this, the utility model provides a battery module and a battery pack, which can utilize the radiating fins to accelerate heat transfer inside the battery module, reduce the risk of heat concentration inside the battery module, further improve the heat dissipation efficiency of the battery module, further balance the internal and external temperatures of the battery module, keep the battery module in a reasonable temperature range during operation, reduce the influence of heat concentration on the performance of the battery module, and in addition, the structural arrangement of the radiating fins and the fins is simple and convenient, thereby reducing the maintenance difficulty of the battery module.

In a first aspect, an embodiment of the present utility model provides a battery module including: a battery assembly; a heat sink at least partially disposed within the battery assembly; and at least one fin which is positioned at one side of the battery component, is connected with the radiating fin and extends outwards, and a plurality of hollowed-out holes penetrating through the fin are formed in at least one fin.

In an embodiment, the heat sink includes a first sub-sheet and a second sub-sheet that are connected to each other, the first sub-sheet is disposed inside the battery assembly, the second sub-sheet extends out of the battery assembly, and the second sub-sheet is connected with at least one fin.

In an embodiment, the battery assembly includes at least two batteries, and the first sub-sheet is fixed between two adjacent batteries and respectively attached to the outer surfaces of the two batteries.

In an embodiment, a first heat dissipation channel is formed on a surface of the first sub-sheet.

In an embodiment, the first heat dissipation channel is a serpentine structure, the first heat dissipation channel of the serpentine structure being arranged around the surface of the first sub-sheet.

In an embodiment, the first heat dissipation channel is filled with foam glue.

In an embodiment, a second heat dissipation channel is formed on the surface of the second sub-sheet, the second heat dissipation channel is communicated with the first heat dissipation channel, and the second heat dissipation channel is communicated with the fin.

In an embodiment, the second heat dissipation channel comprises a fin pipeline connected to the fin, and a transfer pipeline connected to the first heat dissipation channel and the fin pipeline, wherein the fin pipeline and the transfer pipeline are arranged in a crossing mode.

In an embodiment, the number of the fins is a plurality, the fins are parallel to each other, and the distance between every two adjacent fins is equal.

In a second aspect, an embodiment of the present utility model provides a battery pack including the battery module.

By arranging the radiating fins in the battery assembly, the heat transfer in the battery assembly can be quickened by utilizing the radiating fins according to aspects of the utility model, the risk of heat concentration in the battery assembly is reduced, and the radiating efficiency of the battery assembly is further improved; the at least one fin is arranged on one side of the battery assembly, so that the at least one fin is connected with the radiating fin and extends outwards along the width direction of the radiating fin, and the plurality of hollowed holes penetrating through the fin are formed in at least one fin.

Drawings

The technical solution and other advantageous effects of the present utility model will be made apparent by the following detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings.

Fig. 1 shows a perspective view of a battery module according to an embodiment of the present utility model.

Fig. 2 shows an overall elevation view of a fin and fin assembly of an embodiment of the present utility model.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present utility model.

Fig. 1 shows a perspective view of a battery module according to an embodiment of the present utility model. As shown in fig. 1, the battery module may include a battery assembly 1, a heat sink 2, and at least one fin 3. The battery module 1 may be provided with one or a plurality of battery modules, and the present utility model is described by taking the case that the battery module includes one battery module 1 as an example. The battery assembly 1 may include at least two batteries, such as the battery 11 and the battery 12 in fig. 1, each of which may be provided therein with a separator such as a positive electrode sheet, a negative electrode sheet, and the like. A space may be left between every two cells, and the middle of the space may be the inside of the cell assembly 1. The heat sink 2 may be at least partially disposed inside the battery assembly 1. Illustratively, each of the cells is of a rectangular parallelepiped configuration. A housing may also be provided around the battery assembly 1, in which the battery assembly 1 is placed.

In an embodiment, the at least one fin 3 may be located at one side of the battery assembly 1. For example, referring to fig. 1, a fin 3 may be provided at the upper side of the battery assembly 1. The at least one fin 3 may be connected to the heat sink 2 and extend outward in the width direction of the heat sink 2. The width direction of the heat sink 2 (i.e., the y direction in fig. 1) may be parallel to the battery placement direction in the battery assembly 1. The at least one fin 3 may extend leftwards in the width direction of the heat sink 2, or may extend rightwards in the width direction of the heat sink 2.

In the present utility model, the heat sink 2 is a heat conductive member having excellent heat conductivity and maintaining good isothermicity. The heat sink is arranged to have less influence on the performance of the battery assembly because the inner central area of the battery assembly has less functionality. When the temperature of the battery is overhigh, the temperature of the central area of the battery assembly is highest, so that the radiating fin positioned in the central area of the battery assembly can rapidly conduct heat to other parts of the battery, thermal runaway caused by heat concentration is avoided, and the internal temperature of the battery assembly is controlled within a reasonable range.

In an embodiment, referring to fig. 1, at least one of the fins 3 is provided with a plurality of hollowed-out holes 30 penetrating the fin 3. The number of the fins 3 and the number of the hollowed holes 30 may be set according to actual needs, which is not limited in the present utility model.

In one embodiment, referring to fig. 1, the top of the battery 11 may be provided with a burst disk 110 that is oval to reduce the risk of explosion of the battery 11 when the internal pressure is too high. The top of the battery 11 may also be provided with components such as positive and negative terminals. It will be appreciated that in practical applications, the specific structure of the battery may be modified as required, and the utility model is not limited thereto.

By arranging the radiating fins in the battery assembly, the embodiment of the utility model can utilize the radiating fins to accelerate heat transfer in the battery assembly, reduce the risk of heat concentration in the battery assembly and further improve the radiating efficiency of the battery assembly; by arranging at least one fin on one side of the battery assembly, connecting the fin with the radiating fin and extending outwards along the width direction of the radiating fin, and arranging a plurality of hollowed-out holes penetrating through the fin on at least one fin, the embodiment of the utility model can further balance the internal temperature and the external temperature of the battery module, keep the battery module in a reasonable temperature range during operation, reduce the influence of heat concentration on the performance of the battery module, and in addition, the radiating fin and the fin are simple and convenient in structural arrangement, so that the maintenance difficulty of the battery module is reduced.

Fig. 2 shows an overall elevation view of a fin and fin assembly of an embodiment of the present utility model. Referring to fig. 2, the heat sink 2 includes a first sub-sheet 201 and a second sub-sheet 202 connected to each other, the first sub-sheet 201 is disposed inside the battery assembly 1, the second sub-sheet 202 extends out of the battery assembly 1, and at least one fin 3 is connected to the second sub-sheet 202. The height of the first sub-sheet 201 may be lower than or equal to the heights of the cells 11 and 12 on one side of the first sub-sheet 201, so as to reduce the risk of structural limitation of the first sub-sheet 201 after being higher than the adjacent cells. Illustratively, the first sub-sheet 201 and the second sub-sheet 202 are bounded by the top 200 of the battery, and the heat sink 2 located below the boundary may be referred to as the first sub-sheet 201, and the heat sink 2 located above the boundary may be referred to as the second sub-sheet 202. The first sub-sheet 201 is used for collecting heat in the battery, and the second sub-sheet 202 is used for rapidly guiding out the heat, and the two sub-sheets are connected and act together.

In an embodiment, the first sub-sheet 201 is fixed between two adjacent cells and is respectively attached to the outer surfaces of the two cells, so that the heat of the two cells can be transferred to the second sub-sheet 202 and further transferred to the fins 3 through the first sub-sheet 201. Illustratively, the first sub-sheet 201 and the second sub-sheet 202 may each be nickel foil. The nickel foil has good electrical conductivity and thermal conductivity, mature manufacturing technology and relatively low price. The first sub-sheet is arranged in the battery assembly, and the second sub-sheet is connected with at least one fin.

Further, referring to fig. 2, a first heat dissipation channel 21 is formed on the surface of the first sub-sheet 201, and the first heat dissipation channel 21 has a serpentine structure, and the first heat dissipation channel 21 having a serpentine structure is disposed around the surface of the first sub-sheet 201. The thickness of the first sub-sheet 201 and the thickness of the second sub-sheet 202 may be the same, and both the first sub-sheet and the second sub-sheet are flat and hollow. In order to enable the heat sink to conduct heat more rapidly, the thickness of the first sub-sheet 201 and the thickness of the second sub-sheet 202 should be selected to be ultra-thin, and preferably, the thickness of the first sub-sheet 201 and the thickness of the second sub-sheet 202 are both smaller than 2mm. Both surfaces of the first sub-sheet 201 may be provided with the first heat dissipation channel 21. Preferably, the depth of the first heat dissipation channel is 1mm, and the width of the first heat dissipation channel is 0.5mm.

In an embodiment, the first heat dissipation channel 21 may include a first heat dissipation sub-channel 211, a second heat dissipation sub-channel 212, and a third heat dissipation sub-channel 213. The first heat dissipation sub-channel 211, the second heat dissipation sub-channel 212 and the third heat dissipation sub-channel 213 sequentially circulate. One end of the second heat dissipating sub-channel 212 is connected to the first heat dissipating sub-channel 211, and the other end is connected to the third heat dissipating sub-channel 213. The first heat dissipation sub-channel 211 and the third heat dissipation sub-channel 213 are arranged in parallel, and the second heat dissipation sub-channel 212 is respectively arranged to cross the first heat dissipation sub-channel 211 and the third heat dissipation sub-channel 213.

In one embodiment, the first heat dissipation channel 21 is filled with foam. The foam rubber has compressibility and heat absorption and can be elastically deformed. When the heat sink 2 works, on one hand, the heat absorption performance of the foam rubber can enable the first heat dissipation channel 21 to have efficient heat absorption and conduction effects, so that the heat of the heat sink 2 can be quickly conducted to the fins 3; on the other hand, the compressibility of the foam rubber can enable the radiating fin to provide a sufficient breathing zone in the charging and discharging process of the battery module, so that the phenomenon of lithium precipitation of pole pieces in each part in the battery due to uneven expansion is reduced, the influence of the expansion of the pole pieces in the battery is improved, and the risks of degradation of the battery performance and even safety accidents are reduced.

Further, a second heat dissipation channel 22 is formed on the surface of the second sub-sheet 202, the second heat dissipation channel 22 is communicated with the first heat dissipation channel 21, and the second heat dissipation channel 22 is communicated with the fin 3. Similar to the first heat dissipation channel 21, the second heat dissipation channel 22 may be formed on both surfaces of the second sub-sheet 202. Preferably, the second heat dissipation channel has a depth of 1mm and a width of 0.5mm, so that the second sub-sheet 202 can conduct heat more rapidly, thereby improving the heat dissipation efficiency of the heat dissipation sheet. The second heat dissipation channel 22 may also be filled with foam. The foam rubber has compressibility and heat absorption and can be elastically deformed. When the radiating fin 2 works, the heat absorption performance of the foam rubber can enable the second radiating channel 22 to have efficient heat absorption and conduction effects, and then the heat of the radiating fin 2 can be quickly conducted to the fin 3.

In an embodiment, referring to fig. 1 and 2, the second heat dissipation channel 22 includes a fin pipe 221 connected to the fin 3, and a transfer pipe 222 connected to the first heat dissipation channel 21 and the fin pipe 221, and the fin pipe 221 is disposed to intersect with the transfer pipe 222. Illustratively, the fin conduits 221 form a crisscross configuration with the transfer conduits 222. By arranging the fin pipeline 221 connected to the fins 3 and the transfer pipeline 222 connected to the first heat dissipation channel 21 and the fin pipeline 221, the embodiment of the utility model can rapidly disperse the heat conducted out of the first heat dissipation channel 21 on the second sub-sheet 202 in the shortest path, and further directly conduct out the heat to the fins 3 on two sides of the second sub-sheet 202, thereby reducing the risk of heat concentration conducted out of the first heat dissipation channel 21 and improving the heat dissipation efficiency of the heat dissipation sheet.

Further, the number of the fins 3 is plural, the plural fins 3 are parallel to each other, and the intervals between every two adjacent fins 3 are equal. By arranging the fins which are uniformly distributed, the heat conducted by the radiating fins can be further uniformly distributed. The fins 3 may be disposed on both sides of the second sub-sheet 202.

In practical applications, the degree of the density of the fins 3 along the length direction of the second sub-sheet 202 may be adjusted as required. For example, if the heat concentration phenomenon at the end of the second sub-sheet 202 near the first sub-sheet 201 is more obvious than the heat concentration phenomenon at the end of the second sub-sheet 202 far away from the first sub-sheet 201, a first fin assembly may be disposed at the end of the second sub-sheet 202 near the first sub-sheet 201, a second fin assembly may be disposed at the end of the second sub-sheet 202 far away from the first sub-sheet 201, and the interval between every two adjacent fins in the first fin assembly is smaller than the interval between every two adjacent fins in the second fin assembly, that is, the arrangement of the fins presents a dense-to-sparse characteristic along the length direction (i.e., the z direction in fig. 2) of the second sub-sheet 202.

In an embodiment, the fin 3 may be a metal sheet-like structure. Preferably, the fin 3 is a copper sheet-like structure, and is made based on copper foam. The foam copper material has higher heat conductivity and can play a role in enhancing heat transfer.

In an embodiment, one or a plurality of hollowed-out holes 30 of the fin 3 may be provided. The plurality of hollowed holes 30 may be uniformly arranged on the fin where the plurality of hollowed holes 30 are located according to a row and column form. The specific size of the hollow hole 30 can be adjusted adaptively according to the requirement, which is not limited in the present utility model. The evenly distributed hollowed holes are formed, heat conduction at the fins 3 can be further balanced, the internal temperature and the external temperature of the battery assembly are further balanced, the battery assembly is kept in a reasonable temperature range during operation, and the influence of heat concentration on the performance of the battery assembly is reduced.

In one embodiment, each of the hollow holes 30 is honeycomb-shaped. Because the fin is honeycomb network structure, possess very big radiating area, be connected with fin 2, can be with the fin 2 from the inside heat of deriving of battery quick effluvium to reach the effect that effectively reduces battery module temperature, promote battery safety. For example, the hollowed-out hole 30 may be a regular hexagon. The hollowed-out hole 30 may be provided in other shapes, such as regular octagon. Each hollowed-out hole 30 is arranged in a honeycomb shape, so that the stability of the frame of the fin 3 is facilitated, and the material abrasion phenomenon caused by unreasonable hollowed-out hole arrangement is reduced.

In summary, the heat radiating fins are arranged in the battery assembly, so that the heat transfer in the battery assembly can be quickened by utilizing the heat radiating fins, the risk of heat concentration in the battery assembly is reduced, and the heat radiating efficiency of the battery assembly is further improved; by arranging at least one fin on one side of the battery assembly, connecting the fin with the radiating fin and extending outwards along the width direction of the radiating fin, and arranging a plurality of hollowed-out holes penetrating through the fin on at least one fin, the embodiment of the utility model can further balance the internal temperature and the external temperature of the battery module, keep the battery module in a reasonable temperature range during operation, reduce the influence of heat concentration on the performance of the battery module, and in addition, the radiating fin and the fin are simple and convenient in structural arrangement, so that the maintenance difficulty of the battery module is reduced.

In addition, the utility model further provides a battery pack, which comprises the battery module. It is understood that the present utility model is not limited to the specific application scenario of the battery module.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The battery module and the battery pack provided by the embodiment of the utility model are described in detail, and specific examples are applied to explain the principle and the implementation mode of the utility model, and the description of the above embodiments is only used for helping to understand the technical scheme and the core idea of the utility model; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or the technical features in the embodiments can be replaced equivalently; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. A battery module, characterized in that the battery module comprises:

a battery assembly (1);

a heat sink (2) at least partially provided inside the battery assembly (1); and

at least one fin (3) is located one side of the battery assembly (1), the fin (3) is connected to the radiating fin (2) and extends outwards, and at least one fin (3) is provided with a plurality of hollowed-out holes (30) penetrating through the fin (3).

2. The battery module according to claim 1, wherein the heat sink (2) comprises a first sub-sheet (201) and a second sub-sheet (202) which are connected with each other, the first sub-sheet (201) is disposed inside the battery assembly (1), the second sub-sheet (202) extends out of the battery assembly (1), and at least one fin (3) is connected to the second sub-sheet (202).

3. The battery module according to claim 2, wherein the battery assembly (1) comprises at least two batteries, and the first sub-sheet (201) is fixed between two adjacent batteries and is respectively attached to the outer surfaces of the two batteries.

4. A battery module according to claim 2 or 3, characterized in that the surface of the first sub-sheet (201) is provided with a first heat dissipation channel (21).

5. The battery module according to claim 4, wherein the first heat dissipation channel (21) has a serpentine structure, and the first heat dissipation channel (21) of the serpentine structure is disposed around the surface of the first sub-sheet (201).

6. The battery module according to claim 4, wherein the first heat dissipation channel (21) is filled with a foam.

7. The battery module according to claim 4, wherein a second heat dissipation channel (22) is provided on the surface of the second sub-sheet (202), the second heat dissipation channel (22) communicates with the first heat dissipation channel (21), and the second heat dissipation channel (22) communicates with the fin (3).

8. The battery module according to claim 7, wherein the second heat dissipation channel (22) includes a fin pipe (221) connected to the fin (3), a transfer pipe (222) connected to the first heat dissipation channel (21) and the fin pipe (221), the fin pipe (221) being disposed to intersect with the transfer pipe (222).

9. The battery module according to claim 1, wherein the number of the fins (3) is plural, the plural fins (3) are parallel to each other, and the interval between every two adjacent fins (3) is equal.

10. A battery pack, characterized in that the battery pack comprises the battery module according to any one of claims 1 to 9.